Quantification Sedimentology Features and Evolution in East-North segment of Chang-Ping Continetal Deposit Red Basin
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摘要: 长－平陆相红色盆地北东段（系指赣西北红层分布区）由三期5个冲积扇体组成。非同期扇体分别由特定界面所分隔。山口位于盆地北侧，古流向由北向南、南东或南西呈扇形撒开；最大砾石平均体积及混杂系数在扇根处为最大值，向扇中、扇缘呈非线性递减；砾石成分严格受物源区的制约。根据量化沉积学特征及成生背景分析，该区大致经历了初始孕育期、分段剥蚀充填期及后期构造改造三大演化阶段。洪积事件始于晚白垩世、止于早第三纪始新世—渐新世。Abstract: T he C hang-Ping continental deposit red basin consists of five alluvial fans fo rming different three stages. T he different st ages fans were separated by special bounding surfaces respectively.The fan- roots w ere located at the north of the basin.T he palaeoflow direction w as fan shaped dist ributio n.T he average volume of the big g ravels and mixing coefficient w ere biggest in the fan root, and w ere decreased nonlinear progessively from fan root to fringe.T he material source area conty olled t he composition of g ravels. A ccording to quantification sedimentology features and fo rming set ting, it successively underw ent orlginal pregnancy, denude and st rong fill, three stages in the course of t he Basin evolution.T he proluvial events started in late C retaceous Period and finished in Eogene Period Eocene-O ligocene Epoch.
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Key words:
- Chang-Ping B asin quantification /
- sediment ology /
- alluvial fan
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